Large Scale Central

Heritage Express 2-6-2 / Buddly L locomotive question

Does anyone here have or had one of these locomotives? This loco only runs when the tender is connected to it. I am just wondering if this is normal for this loco or not.

FYI: I also posted this question on MLS site.

IMG_0498 (Small)

https://www.mylargescale.com/threads/heritage-express-2-6-2-buddy-l-locomotive-only-runs-when-tender-is-connected.94275/?post_id=1186611#post-1186611

And to save everyone time and effort, this question was already answered here!
https://largescalecentral.com/t/buddy-l-2-6-2-locomotive/58613