Finally, I found the culprit. It's the BTT - Overflow Icons preset that I've downloaded here:
When I deactivate it, no more problems. When I reactivate it, the problem reappears. However, I don't understand why.
Finally, I found the culprit. It's the BTT - Overflow Icons preset that I've downloaded here:
When I deactivate it, no more problems. When I reactivate it, the problem reappears. However, I don't understand why.