Russian forum trolls aside, there is a dynamic at play here that escapes most people's attention.
A general election is due in Poland this fall, and it is in the Kremlin's interest to keep the existing lot in power (they're extremely anti-EU and anti-West; permeated by Russian intelligence; many consider Germany - not Russia - to be the "true enemy" of Poland). The ruling party is struggling in the polls, which leads most rational observers to expect a constitutional coup (note that Poland is a sham democracy at this point - I'd be happy to explain why, but I don't want to post a wall of text). In any case, a pretext is required for an outright power grab. This may very well come in the form of a military provocation on the Polish border, which would allow the government to introduce a state of emergency, postpone elections indefinitely, and brand anyone who opposes such measures as "Russian agents". This is a perfectly plausible scenario, and many here outright expect it.
From the Kremlin's POV this has to be weighed against the risk of uncontrolled escalation - however, it might explain the presence of Wagner in Belarus, as well as Luka's weird comments voiced during his recent visit to Moscow (he complained that "the Wagner guys are saying they want to 'visit' Warsaw and Rzeszów"). Luka has consistently tried to stay out of this war, and may still be trying to, but if Putin uses Belarus as a staging ground for attacks on NATO countries - Poland, primarily - then he has failed in his objective.
Militarily speaking, the 4000 or so Wagnerites currently present in Belarus are, of course, not capable of conquering and holding Polish territory; however, various provocations cannot be ruled out for reasons outlined above.