Comment 10 for bug 1917916

Just tested, on my VM with Ubuntu 18.04, installing opera via snap works fine with simple mask "opera".

Process names are the same as in your situation, i.e. a simple mask of word "opera" suffices:
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2021-03-09 22:19:25.424813: PT match, uid: 1000, exe: /snap/opera/113/usr/lib/x86_64-linux-gnu/opera/opera, cmdl: n/a
2021-03-09 22:19:25.425522: PT stats, users: 1, cache: 245, add: 19, rm: 1, lost: 0, nocmd: 0, qc: 2, changed: 0, admatch: 19
----------------------------

Please check once more, maybe there was a little typo in your mask previously, like an unwanted space somewhere or so.