I've had a bug recently where the LSPDFR tab doesn't show in the pause menu. This is a big game-breaker in regards to LSPDFR since that's where you select / create / switch characters and change settings.
All posts in regard to this particular bug has been given no solutions, which is why I'm creating this post incase someone runs into it and needs to find the fix - something I couldn't do and had to figure out myself.
For me, if I ticked the setting in RPH "Enable counter measures against online vehicles being removed in singleplayer," it would present to me while I was loading into the game "Fatal error." This also breaks the LSPDFR tab being added in the pause menu.
Solution: In order to get your LSPDFR pause tab back in the pause menu, disable the RPH "Enable counter measures against online vehicles being removed in singleplayer" option. This will stop you from getting the "Fatal error" message on the loading screen and will give you your LSPDFR tab back.