If you summon a Marker entity and then use /spectate to "enter" it, your view will be updated to match the marker, but you'll still be able to move around and rotate normally as if you weren't spectating anything. If you then press dismount (shift), your view will match the marker again as if you had been there the whole time.
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We're tracking this issue in MC-223142, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-223142.