The model of the spore blossom differs very subtly between Java and Bedrock Edition. This is best seen where the petals intersect.

Compare the area in the middle of two petals, containing darker pixels, which appears square in Bedrock Edition but concave in Java Edition:

Bedrock Edition screenshot taken from a video by wattles.

How to fix

This may be possible to fix if model json files permitted a continuous range of angles an element can be rotated by, rather than only increments of 22.5 degrees. This way, it'd be possible to rotate each teal by the optimal angle to match the Bedrock Edition model.