As a workaround, in Engrave mode, select the 1st repeat ending at bar 21, set No. times played to 4, set Times played for segment to 1,3 , and set Custom text to 1. . Then select the 2nd repeat ending, and set Custom text to 2. .
This setting will probably give you the playback you want.
(workaround)dorico jumps over bar 21&22 after segno.dorico (464.6 KB)
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