Currently Have only tested this in the Nether and on soul sand, but if you walk or crouch near a block of lava, full or any other state of level, the player will gain a random ignition of flame for no apparent reason, Originally found this on a realm, then tested it in a singleplayer world. All tested in vanilla Minecraft.
The texture pack is on in the video.
video link due to the file being to big https://youtu.be/sPAIst_m0gM
Thank you for your report!
We're actually already tracking this issue in MC-1448, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki