This is a java bug where if you stand in fire it lights you while flame arrows hitting you every tick does NOT matter. Also, this bug with the arrows on top of me goes to bugs.mojang.com/browse/MC-244783 which is another bug related to this.
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We're tracking this issue in MC-162551, so this ticket is being resolved and linked as a duplicate.
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Based off of MC-63260 this seems to be working as intended