Issue with rec() else=copy not passing old labels

[aito123]

Hello active user of sjmic really cool package (sjverse in general).

Problem: while recoding and labelling a variable i saw that my old labels weren't been passed by else=copy argument when i added new labels. Here the reprex:

#vector using dput() function
data<-structure(c(1, 0, 0, 0, 0, 0), label = "¿La municipalidad realizó procedimiento administrativo de Licencia de edificación para viviendas de hasta 5 pisos o 3000 m² ?", format.spss = "F12.0", display_width = 12L, labels = c(Si = 1, 
No = 2), class = c("haven_labelled", "vctrs_vctr", "double"))

#(1) error not passing old labels when "adding" another
as.data.frame(data) %>% mutate( across(1, ~as_labelled(rec(., rec = '2=0[No];else=copy'))), ) %>% pull(1)
# <labelled<double>[6]>: ¿La municipalidad realizó procedimiento administrativo de Licencia de edificación para viviendas de hasta 5 pisos o 3000 m² ?
# [1] 1 0 0 0 0 0
# 
# Labels:
#  value label
#      0    No

#(2) desired result passing old labels
as.data.frame(data) %>% mutate( across(1, ~as_labelled(rec(., rec = '2=0;else=copy'))), ) %>% pull(1)
# <labelled<double>[6]>: ¿La municipalidad realizó procedimiento administrativo de Licencia de edificación para viviendas de hasta 5 pisos o 3000 m² ?
# [1] 1 0 0 0 0 0
# 
# Labels:
#  value label
#      0    No
#      1    Si

I think the behavior in (2) desired result passing old labels should also work in scenario (1) error not passing old labels when "adding another. In conclusion, it shouldn't drop labels 1 Si because i'm specifying that i want else=copy.

Let me know if its possible to fx this, thanks for the attention. Regards