When switching to spectator in crawl mode (1 block high space), you still crawl in spectator

when you are crawling (when you are 1 block high) and you switch to spectator by either command or F3+N you are still slow in spectator like you were crawling and it also stops when entering a 2 block or higher area. but this only happens sometimes

What I expected to happen was...:
when turning to spectator i expected it to go back to normal player height and get normal spectator speed

What actually happened was...:
it sometimes keeps the crawling speed and player height even in spectator as long as flying in a 1 high space or inside blocks and only stopped when entering 2 block or higher area

Steps to Reproduce:
1. go in crawl position inside a tunnel by for example a trapdoor
2. switch to spectator by using /gamemode spectator or F3+N
3. it does not happen all the time so maybe you have to try a few times