Attach (recommended) or Link to PDF file here: 

[anootation_problem.pdf](https://github.com/mozilla/pdf.js/files/7611701/anootation_problem.pdf)

Configuration:
- Web browser and its version: 98.0.4732.0 (Official Build) canary (64-bit)
- Operating system and its version: Edition Windows 10 Home, Version 20H2, OS build 19042.1348
- PDF.js version: 2.12.211
- Is a browser extension: Yes

Steps to reproduce the problem:
1. Open pdf file
2. Scroll to bottom of page and point to annotation of 'loss ft(x) >= 0,' text
3. Compare the displayed text with same in Acrobat Reader

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/2311076/143681452-0afa9a98-b16b-4a39-a393-631eb1c8c41f.png)

What went wrong? (add screenshot)
Text size not respected (e.g., in superscripts and subscripts)
![image](https://user-images.githubusercontent.com/2311076/143681575-2a2fe4de-cbad-4625-a6fe-2212fa20b8f1.png)

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

/* Copyright 2021 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import {
  $acceptWhitespace,
  $childrenToHTML,
  $clean,
  $content,
  $extra,