Mine ‘21 TP9 did this when I bought it. No issues without the silencer, but the same issue as OP has.
I ended up sending it back to B&T and they sent it back to me “fixed”. Still had the same issues as before but it was slightly better. Can’t remember exactly what B&T did the first time, but I believe they replaced and tweaked the slide lock.
After some parts swapping from another TP9 I narrowed the issue down to some part of the feed ramp/slide lock assembly. I think I got B&T to send me the whole feed ramp assembly, as I’m pretty sure I didn’t send it in a second time. The new assembly solved my issue.
I have both the original B&T can and the newer RBS can and both have been g2g since then.