The Did you find webform block is always wrapped in a <section> element. Since the block title is always hidden (as per Canada.ca) there is no H2 added to the block, and this causes a WCAG validation warning. This block template file should follow a similar approach to set the wrapper element as in the related tickets.
After you run a page with the Did you find webform on it through W3C markup validation, see warning:
Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections, or else use a div element instead for any cases where no heading is needed.
Fixed
4.3
WxT Bootstrap
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It's likely this issue predates Contrib.social: some issue and comment data are missing.