Why did pet dmg get nerfed?

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Pre patch. My lvl 49 necro pet. Dark blue at 51 would hit for max of 51-55 (most times would be a max 51 hit pet)
Post patch. Dark blue pet hitting for max 49.

Pre patch. Light blue At 51 would hit for max 49.
Post patch. Havnt had one to test yet.

6 pet tests. All been dark blue. All have max hit of 49. (useing 2 FS short swords)