Stronghold never contains end portal and it's only possible to access the end by building the portal.
Linked issues
Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-19426, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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I found a stronghold like this once; it was so strangely generated that there was no portal room and some rooms cut off passageways entirely. However, I don’t think this occurs for me 100% of the time.