There are a number of reports in the Local Search Forum that businesses are seeing their logos disappear from their Google local listings in search. I currently see mine so maybe it was a temporary glitch and it is now fixed.

Here is a screen shot of my Google local listing with an arrow pointing to the logo location:

Google added support for these logos back in June 2019.

Here are some of the complaints from the other day in the Local Search Forum:

One reported this morning that their logos have returned but another issue with photo views. I do not see the photo views issue either…

Google My Business is known to be buggy…

Forum discussion at Local Search Forums.