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Thanks sneeze, very interesting.
I haven't tried taping my .22LR or airgun but would think twice now.
Do you have a photo of the groups ?

Looking at the amount of air that would be pushed out of the barrel before the bullet arrives:

............barrel .........suppressor
d (mm)...7....... ......32
r..............3.5 .......... ...

Simplest explanation is that it was just random.
I shot the tape first, then reloaded and fired the untaped shot a bit quicker so perhaps the barrel was heating more. Another time I might wait a...

"A fair question and one often asked ..."
Can I put tape over my suppressor and shoot through it ?
Only one way to know for sure

Method:
I put a bit of electrical tape over the hole in the end...