Well do you just want a dead axolotl in a bucket?
You will need water to catch a axolotl , this is not a glitch.
https://bugs.mojang.com/browse/MCPE-136042?focusedCommentId=1041769&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1041769
Maybe its intentional?
Maybe its not supposed to , being that the nether has no oxygen or something?
Well do you just want a dead axolotl in a bucket?
You will need water to catch a axolotl , this is not a glitch.