I've been playing Minecraft since December on Nintendo Switch, its now April and so far I have only ever seen 1 small slime in a cave.
I have hung out for 8 nights in a swamp and no slimes.
I have now used a chunk finder to find a slime chunk and have created a slime farm for bedrock edition by silentwisperer and still have no slimes.
This is getting very frustrating.
Technical or not, there are similar issues around.
I have found a work around for anyone having similar issues if they can still read this,
which is to run it in Windows 7 compatibility mode.
Right click the launcher shortcut
properties
compatibility
compatibility mode - Run this program in compatibility mode for - Windows 7