If you type in: /replaceitem entity @p slot.hotbar.0 minecraft:spawn_egg 72
you will get a normal spawn egg. That means, you cant give yourself an specific spawn egg with commands.
Environment
Normal: /replaceitem entity @p slot.hotbar.0 minecraft:spawn_egg 72 = siverfish spawn egg
in this version: /replaceitem entity @p slot.hotbar.0 minecraft:spawn_egg 72 = normal spawn egg wich cant do anything
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-86282. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.