I am only able to reproduce this issue when the uploaded BAM dataset is truncated. This might have occurred during upload. The complete BAM for this accession is nearly twice as large at the NCBI source.
Try loading directly from the source instead. The tool to use is NCBI SRA Tools > Extract reads in BAM format from NCBI SRA.
This use-case could be error trapped better. I'll suggest that to the developers on the ticket I referenced in my earlier comment.
Thanks! Jen, Galaxy team