Promotion while on H1B

[RPIW99]

My employer wanted to promote me to a Tech Lead from a Software Engineer III. But now they think it might cause a problem with my H1B as my last promotion was only a year ago and want me to wait. Are their concerns valid? I would think that the most they would need to do is file for an amendment.

My H1B was extended in October last year and my 6 years will end in October 2014.