Multiline Text Fields becomes hidden if they include one "{" left curly brace

When using "{" only left brace in a multiline text field,the field becomes hidden.But if you use "}" right curly brace after, the field does not become hidden.

Forexample : MsCRM{onpremise   --> this will become hidden

But MsCRM{onpremise} won't become hidden.

And that occurs every multiline text fields on any entity.And there is not any JS validation control,regex control etc.Just a plain text.

Is that a common issue?

Should i open a ticket for that or is there a workaround.

We are using CRM 2016 On Premise update v1

Thank you.