I've installed new Thirtybees 1.3 for testing new functions. First issue that I found - issues in core updater (last versions 1.4 - 1.4.3).
When I try to check for updates - core updater working and found that my fresh installation are corrupted! 😮 and ask to fix it (screenhort #1).
In next step - Ajax request failed ..(screeshot #2)
Also ajax issues was founded in some third-side modules, that worked fine in 1.2 (like Elementor)
I've tried change php versions 7.2 - 7.4 but no changes.