I found another bug today that could lead to this problem. I suggest waiting for the upcoming patch release and then re-assessing the problem. I expect it to disappear with the fix I am working on.
Unfortunately, the bug is quite fundamental, and I can’t think of a (practical) workaround.
The impractical workaround is: Run cmk -vvn --plugins interfaces <HOST> and cmk -vvI --plugins interfaces <HOST>, compare the reported sections 2 lines after the line Source: SourceType.HOST/FetcherType.SNMP, and set up a WATO Host rule to disable all interface sections that are listed in the former call, but not in the latter (e.g. if_lancom).
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