Hybrid Mortar/Backer Shower Proofing

Been a long road to get here! Ended up with a hybrid material shower due to contractor issues.
Can someone advise if any additional liquid or membrane waterproofing is advised on the niche wall ? Corners or wallface? About to start tiling. The pan liner goes up the 6 inches above curb all the way around. Kerdiflex only goes up about 4ft in ther corners since I ran out, was thinking it should go to ceiling now since I' m paranoid and not sure if additional liquid is i order anywhere else.
Float on niche wall, hydrodefense backer on side walls with kerdiflex/redguard. The niche was fixed (after contractor used flexseal on drywall) with backer board, kerdifix and red guard. Thanks again Isaac for the suggestion.
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@Isaac Ostrom
They did the drywall, black paper material and wire under the float