This has actually happened for as long as I remember, and it's weird. It most often happens when the sun is setting, and I don't know about when rising.
MCPE-128981
The sun gets larger when facing south, smaller when facing north, and medium when facing directly at it
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We're tracking this issue in MCPE-7982, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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