I've read the FINRA rules 3 times and not clear to me if the B changes fall within definition of "corporate action"- Excerp from FINRA Rule 6490:
OTC issuers provide notice to FINRA to affect a full range of company-related
actions pursuant to SEA Rule 10b-17, including dividends or other distributions in cash
or kind, stock splits or reverse stock splits, or rights or other subscriptions offerings
(“SEA Rule 10b-17 Actions”). In addition, FINRA processes documents related to other
company actions, including the issuance or change to a trading symbol or company name,
mergers, acquisition, dissolutions or other company control transactions, bankruptcy or
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liquidations (“Other Company-Related Actions”; and together with SEA Rule 10b-17
Actions, collectively referred to hereinafter as “Company-Related Actions”).

The way I read it, if the company's resolutions effecting the B share changes did not trigger a FINRA filing, it may not be a "corporate action" under the definition, as all of the examples cited relate to actions which do in fact require FINRA filing- Bottom line, I have no clue, LOL