Google Sans: Incorrect positioning of Assamese vowel signs ু and ূ with ৰ

Google Sans incorrectly positions the Assamese vowel signs `ু` (U-kar, U+09C1) and `ূ` (UU-kar, U+09C2) when used with the Assamese character `ৰ` (RA, U+09F0).

The vowel signs appear below the base character `ৰ` instead of being positioned correctly according to Assamese script shaping rules.

For example:

- `ৰু`
- `ৰূ`

The issue appears to affect the positioning of `ু` and `ূ` specifically when they are used with `ৰ`.

**To Reproduce**
Render the following Assamese text:
ৰু
ৰূ

**Expected behavior**
The Assamese vowel signs ু (U-kar) and ূ (UU-kar) should be correctly shaped and positioned relative to ৰ according to Assamese orthographic and typographic conventions.

**Screenshots**

**Additional context**
The corresponding Bengali character র (U+09B0) renders correctly with ু (U+09C1) and ূ (U+09C2). This suggests that the issue may specifically affect the Assamese character ৰ (U+09F0) and its OpenType shaping or positioning behavior in Google Sans.