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It can't be an ending diagonal, because it has to consist of only 3 waves like 3-3-3-3-3. Wave 1 and 4 need to overlap in an ending diagonal, too.
What I am seing is, your triangle pattern could be an overshooting wave B like ABC, in the form of a running flat or expanded flat.

Thank you for pointing that out. In that case it makes the structure less bearish than I initially thought.