**Steps to reproduce**
Goto Special:Import on Telugu wikibooks https://te.wikibooks.org/wiki/%E0%B0%AA%E0%B1%8D%E0%B0%B0%E0%B0%A4%E0%B1%8D%E0%B0%AF%E0%B1%87%E0%B0%95:%E0%B0%A6%E0%B0%BF%E0%B0%97%E0%B1%81%E0%B0%AE%E0%B0%A4%E0%B0%BF{F34465601}
from W:te
Try to import:
సామెతలు - అ
Select all checkboxes as shown in enclsoed picture.
**What is expected**
Import succeeds
**What is observed**
Error message
Error
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If you report this error to the Wikimedia System Administrators, please include the details below.
Request from 106.51.27.125 via cp5010 cp5010, Varnish XID 644492
Error: 503, Backend fetch failed at Mon, 24 May 2021 04:16:18 GMT