When a player in survival mode in first-person view enters the Nether from the Overworld through a Nether portal, and switches to spectator mode while inside the portal, the visual effect above the player's head will not be removed even after leaving the portal.
Method:
First, switch to Survival mode.
Then, enter the Nether portal to teleport to the Nether.
Next, without leaving the portal, switch the game mode to Spectator.
Finally, move around; the portal's pattern and distortion effects will not disappear when the player leaves the portal.
We're tracking this issue at MCPE-163541, so this report is being resolved and linked as a duplicate.
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