This only seems to affect worlds created before the 20w17a snapshot. Worlds created in the 20w17a snapshot appear unaffected.
Dark oak and spruce saplings never progress past stage 1 when in 2x2 formation, even with bonemeal. Every other sapling type will grow, including 2x2 jungle saplings. Tested in superflat creative as well as survival.
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SunCat
Thank you for your report!
However, this issue is a Duplicate of MC-179909.
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Jungle saplings are not working either. I have narrowed it down to corrupted region/poi files. I found an area of my world where I did not build on yet. I deleted the region and poi files for that region, went back to the area and trees grow fine again. (Do not do this in an area that you have built in, it will revert everything back to the way it was when you first found it)