Entitys killed by Sweeping Enchant give Xp to the Xp bar not the mending items

When I am using A sword with sweeping I only get Xp from the the Main mob killed (not killed by sweeping.) This makes it really hard to mend items even with huge Xp farms. Note: I'm using Optifine but I will provide snapshots without optifine and debug screen. This is in 1.15.2 not 1.16.4 the post the bug it required me to put it as 1.16.4/1.17+ none others (Idk why)