[Bug] PDF generation fails when TOC has many bookmarks

**Describe the bug**
Hi, I have strange problem with generating PDF when TOC.md contains some links with bookmarks. It works locally on my laptop but when I'm doing the same on Windows Server PDF generation fails.

PDF generation turned off - no error.
In generated TOC.html links are working.
I've tried TOC.yml instead TOC.md - the same error.
Locally on Windows 11 works, but on Windows server - it fails.

**To Reproduce**
Steps to reproduce the behavior:
1. Create file "article1.md" with following content:
```
# header1
## header2
### header3-1
### header3-2
### header3-3
### header3-4
### header3-5
```

2. Create "TOC.md" with following content:
```
# [header1](article1.md#header1)
## [header2](article1.md#header2)
### [header3-1](article1.md#header3-1)
### [header3-2](article1.md#header3-2)
### [header3-3](article1.md#header3-3)
### [header3-4](article1.md#header3-4)
### [header3-5](article1.md#header3-5)
```

3. Run docfx with pdf generation

docfx.json:
```json
{
"build": {
"content": [
{
"files": ["**/*.{md,yml}"],
"exclude": ["**.*.pdf"]
}
],
"resource": [
{
"files": ["**/media/**"],
"exclude": ["**/obj/**", "**/includes/**"]
}
],
"overwrite": [
{
"exclude": ["obj/**", "_site/**"]
}
],
"dest": "_site",
"globalMetadata": {
"_appTitle": "Test",
"_disableContribution": "true",
"_enableSearch": true,
"pdf": true,
"pdfTocPage": true,
"pdfFileName": "doc-pdf.pdf"
},
"globalMetadataFiles": [],
"fileMetadataFiles": [],
"template": [
"default",
"modern"
],
"postProcessors": ["ExtractSearchIndex"],
"markdownEngineName": "markdig",
"noLangKeyword": false,
"keepFileLink": false,
"cleanupCacheHistory": false,
"disableGitFeatures": false
}
}
```

4. Get error:
```powershell
(...)
XRef map exported.
Extracting index data from 4 html files
Content\doc-pdf.pdf: 0%
InvalidOperationException: Failed to build PDF page []:
http://127.0.0.1:58412/Content/article1.html#header3-5
at void MoveNext() in PdfBuilder.cs:156
at void MoveNext() in PdfBuilder.cs:238
at void MoveNext()
at async Task CreatePdf(Func> printPdf,
Func> printHeaderFooter, ProgressTask task,
Uri outlineUrl, Outline outline, string outputPath,
Action> updatePageNumbers) in PdfBuilder.cs:235
at void MoveNext() in PdfBuilder.cs:105
at void MoveNext()
at void MoveNext() in PdfBuilder.cs:98
at void MoveNext() in Progress.cs:103
at void MoveNext() in Progress.cs:138
at async Task RunAsync(Func> func) in DefaultExclusivityMode.cs:
40
at async Task StartAsync(Func> action) in
Progress.cs:121
at async Task StartAsync(Func action) in Progress.cs:
101
at async Task CreatePdf(string outputFolder) in PdfBuilder.cs:96
at async Task CreatePdf(string outputFolder) in PdfBuilder.cs:114
at async Task CreatePdf(string outputFolder) in PdfBuilder.cs:114
at void b__0() in DefaultCommand.cs:53
at int Run(LogOptions options, Action run) in CommandHelper.cs:48
at int Execute(CommandContext context, Options options) in DefaultCommand.cs:
31
at Task Execute(CommandContext context, CommandSettings settings) in
CommandOfT.cs:40
at Task Execute(CommandTree leaf, CommandTree tree, CommandContext
context, ITypeResolver resolver, IConfiguration configuration) in
CommandExecutor.cs:144
at async Task Execute(IConfiguration configuration, IEnumerable
args) in CommandExecutor.cs:83
```
Full log: [log.txt](https://github.com/dotnet/docfx/files/15318957/log.txt)

**Expected behavior**
PDF should be generated without any errors/warnings.

**Context (please complete the following information):**
- OS: Windows Server 2019, 2022
- Docfx version: 2.76.0

**Additional context**

I noticed - when I remove last line in TOC.md - this one:
```
### [header3-5](article1.md#header3-5)
```
Everythings works and there is no error:

```powershell
XRef map exported.
Extracting index data from 4 html files
Content\doc-pdf.pdf: 0%
Content\doc-pdf.pdf: 53%
Content\doc-pdf.pdf: 99%

Build succeeded.

0 warning(s)
0 error(s)
```
Adding any next link with bookmark causes error but adding link without bookmark works. So it looks like there is some problem above 6 links with bookmarks or maybe there is limitation I don't know. Could someone check this issue or tell me how to resolve/workaround that?