Hi
I wasn’t able to reproduce this behavior. Where are you printing string? Is Blueprint in level, or is it spawned at Begin Play?
If I understand you correctly, it works correctly during Play, but when you Simulate, it stops working, and then when Playing again it still doesn’t work?
Are you able to reproduce this in a new project? If so, please and attach project (or get us a download link) so we can take a look. Thanks!