Hi Naresh,
I tested and didn't encounter your issue, could you share you configuration and steps?
Below is my configuration:
Environment: Wave 2 release enable
Version: 1710 (9.1.0.9627)
Currency field:
1. System OOB Credit Limit:

2. Custom Asset:

Display in contact form:

Marketing email(dynamic expressions are embedded in Text element):

Result(Opened in Gmail online):

Other:
Have you tried open the email with different clients such Gmail online, Outlook online and Outlook client?
Were you adding the field from modern form editor in PowerApps?
Regards,
Clofly