Bottom and top gridline longitude labels not displaying for x axis
Description
I cannot display bottom or top labels for LambertConformal projections.
Code to reproduce
import matplotlib.pyplot as plt
import cartopy.crs as ccrs
import cartopy.feature as cfeature
crs = ccrs.LambertConformal(central_longitude=145,
central_latitude=-37.2, standard_parallels=(-37, -38))
ax = plt.axes(projection=crs)
bounds = [-30000, 30000, -100000, -30000]
ax.set_extent(bounds, crs=crs)
ax.add_feature(cfeature.LAND)
ax.add_feature(cfeature.COASTLINE)
gl = ax.gridlines(crs=ccrs.PlateCarree(), draw_labels=True)
plt.show()

Full environment definition
Operating system
Windows 10
Cartopy version
0.20.1
conda list
# Name Version Build Channel
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affine 2.3.0 pypi_0 pypi
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argon2-cffi 21.1.0 py39h3811e60_2 conda-forge
astunparse 1.6.3 pypi_0 pypi
async_generator 1.10 py_0 conda-forge
attrs 21.2.0 pyhd8ed1ab_0 conda-forge
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babel 2.9.1 pyh44b312d_0 conda-forge
backcall 0.2.0 pyh9f0ad1d_0 conda-forge
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cachetools 4.2.2 pypi_0 pypi
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pip list
Package Version
----------------------------- -------------------
absl-py 0.12.0
affine 2.3.0
anyio 3.3.4
argon2-cffi 21.1.0
astunparse 1.6.3
async-generator 1.10
attrs 21.2.0
autopep8 1.5.7
Babel 2.9.1
backcall 0.2.0
backports.functools-lru-cache 1.6.4
bleach 4.1.0
Bottleneck 1.3.2
brotlipy 0.7.0
cached-property 1.5.2
cachetools 4.2.2
Cartopy 0.20.1
certifi 2021.10.8
cffi 1.15.0
cftime 1.5.1.1
chardet 4.0.0
charset-normalizer 2.0.0
click 8.0.3
click-plugins 1.1.1
cligj 0.7.2
colorama 0.4.4
cryptography 35.0.0
cycler 0.11.0
debugpy 1.5.1
decorator 5.1.0
defusedxml 0.7.1
entrypoints 0.3
f90nml 1.1.2
flatbuffers 1.12
fonttools 4.28.1
fortran-language-server 1.12.0
future 0.18.2
gast 0.4.0
google-auth 1.30.0
google-auth-oauthlib 0.4.4
google-pasta 0.2.0
grpcio 1.34.1
h5py 3.4.0
idna 3.1
importlib-metadata 4.8.2
importlib-resources 5.4.0
ipykernel 6.5.0
ipython 7.29.0
ipython-genutils 0.2.0
ipywidgets 7.6.3
jedi 0.18.1
Jinja2 3.0.3
joblib 1.1.0
json5 0.9.5
jsonschema 4.2.1
jupyter-client 7.0.6
jupyter-core 4.9.1
jupyter-server 1.11.2
jupyterlab 3.2.4
jupyterlab-pygments 0.1.2
jupyterlab-server 2.8.2
jupyterlab-widgets 1.0.0
keras-nightly 2.5.0.dev2021032900
Keras-Preprocessing 1.1.2
keras-tuner 1.0.2
kiwisolver 1.3.2
Markdown 3.3.4
MarkupSafe 2.0.1
matplotlib 3.5.0
matplotlib-inline 0.1.3
mistune 0.8.4
munkres 1.1.4
nbclassic 0.3.4
nbclient 0.5.9
nbconvert 6.3.0
nbformat 5.1.3
nest-asyncio 1.5.1
netCDF4 1.5.8
notebook 6.4.6
numpy 1.21.4
oauthlib 3.1.0
olefile 0.46
opt-einsum 3.3.0
packaging 21.3
pandas 1.3.4
pandocfilters 1.5.0
parso 0.8.2
patsy 0.5.2
pexpect 4.8.0
pickleshare 0.7.5
Pillow 8.4.0
pip 21.3.1
prometheus-client 0.12.0
prompt-toolkit 3.0.22
protobuf 3.17.0
PsychroLib 2.5.0
ptyprocess 0.7.0
pvlib 0.8.1
pyasn1 0.4.8
pyasn1-modules 0.2.8
pycodestyle 2.7.0
pycparser 2.21
Pygments 2.10.0
pyOpenSSL 21.0.0
pyparsing 3.0.6
pyproj 3.3.0
PyQt5 5.12.3
PyQt5_sip 4.19.18
PyQtChart 5.12
PyQtWebEngine 5.12.1
pyrsistent 0.18.0
pyshp 2.1.3
PySocks 1.7.1
python-dateutil 2.8.2
pytz 2021.3
pyzmq 22.3.0
rasterio 1.2.10
requests 2.26.0
requests-oauthlib 1.3.0
rioxarray 0.8.0
rsa 4.7.2
scikit-learn 1.0.1
scipy 1.7.2
seaborn 0.11.2
Send2Trash 1.8.0
setuptools 59.2.0
Shapely 1.8.0
six 1.16.0
sniffio 1.2.0
snuggs 1.4.7
statsmodels 0.13.1
synthia 1.0.0
tabulate 0.8.9
tensorboard 2.5.0
tensorboard-data-server 0.6.1
tensorboard-plugin-wit 1.8.0
tensorflow 2.5.0rc3
tensorflow-estimator 2.5.0rc0
termcolor 1.1.0
terminado 0.12.1
terminaltables 3.1.0
testpath 0.5.0
threadpoolctl 3.0.0
toml 0.10.2
tornado 6.1
tqdm 4.60.0
traitlets 5.1.1
typing_extensions 4.0.0
urllib3 1.26.7
wcwidth 0.2.5
webencodings 0.5.1
websocket-client 1.2.1
Werkzeug 2.0.0
wheel 0.37.0
widgetsnbextension 3.5.1
wrapt 1.12.1
wrf-python 1.3.1
xarray 0.20.1
zipp 3.6.0
How did you install Cartopy? Can you check your installation of cartopy? Neither the conda list nor the pip list you posted shows cartopy installed.
sorry was on a different shell -- now updated.
This seems to be a bug related to inline labels. By default, whether x labels are shown inline depends on the CRS, and for Lambert Conformal they are shown inline. Passing x_inline=False to gridlines() shows the labels as expected (here also with rotate_labels=False):

Thanks @letmaik -- this worked.