Apart from the update, XCOM 2 mods have also had a history of other problems related to Vanilla and WOTC, and the apparent Steam Workshop is not working. The cause for this would probably be the change in the launcher, which has also been a liability for the rest. Suppose your mods stopped working around nine months ago, or maybe they haven’t been as consistent.
How To Fix Mods Not Working In XCOM 2 XCOM 2 Mods Not Working