"Save as" interrupts background saving resource file without any hints which leads to lose work
While background saving a resource file (e.g. in .ai format) one needs to be very careful to not start "Save as" processes (e.g. PDF) before background saving process has finished otherwise il will be interrupted without any hint. This will lead to lose work in your resource file due to switching file format.
It would be much better like Photoshop does: background saving with alert when trying to "Save as"
Yes, this! Just wrote the same exact bug yesterday, didn't notice this one.