Duplicate text background color hidden

[calocan]

Problem description

In night mode the normal duplicate text background color (pink) doesn't show up when you type duplicate text in the first field.

Checklist

Please put x inside brackets if following sentences apply to you:

• [x] I verified that I use the lastest add-on version,
• [x ] I verified that I use the lastest Anki version,
• [x ] I tried to disable other add-ons to find the culprit,
• [ x] I checked if anyone reported this problem before, as well as Known issues section on add-ons page,
• [ ] My issue is solved when holding shift while starting Anki.

Information about your Anki Setup

OSX Desktop with Night Mode Enabled

Please open Anki, go to Help → About, look-up two lines, starting with Version: and Qt and copy-paste them below:

Version 2.1.13 (3ba55990)
Qt 5.12.1 PyQt 5.11.3

Please got to Night Mode → About now and copy-paste the first line from the pop-up window below:

Night Mode 2.3.3

Please fill in your OS details (Linux/Mac/Windows):

OS: Mac 10.14.6

If you have a compatibility problem with a specific add-on or add-ons, please paste the add-on page links below:

• Other add-on name

Backtrace (if any)

If you had an error which resulted in producing exception with a backtrace, please paste the backtrace below:

[paste your backtrace in here if you got any; otherwise feel free to remove this part]