Is it possible that, in cases where only one instrument is playing, only one number is shown next to the instrument name?
Is that a publishing standard somewhere?
We’d need to see the page before this, but I think the issue might be that at the start of bar 83, both bassoons are still technically “playing”, so the staff label indicates that. It’s not until the fourth beat that it becomes bassoon 1 only.
You might be able to fix this with a manual condensing change.
For example in Polskie Wydawnictwo Muzyczne (PWM).