Table sticky headers break in Firefox, in RTL on dynemic column changes

[Eddygn]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Sticky headers to work in RTL.

What is the current behavior?

The columns and their headers become misaligned, semi disappear, and the rows show behind the headers on scroll

What are the steps to reproduce?

https://stackblitz.com/edit/angular-gmgfau

What is the use-case or motivation for changing an existing behavior?

Sticky headers and dynamic columns are an important functionality in a datatable.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material 6.4.7
Firefox 62.0.2

Is there anything else we should know?

From what I saw, forcing a re-flow used to work as a 'workaround'.

[Eddygn]

Or if anyone has a reliable way to cause re-flow that works as workaround or any other workaround that works, it will be really appreciated.