string.Split not working as expected when using multiple string separators and StringSplitOptions.TrimEntries

[ccamposh]

Description

Considering these next C# code snippets results is the trimmed string "text",
" text ".Split(',', StringSplitOptions.TrimEntries)
" text ".Split(",", StringSplitOptions.TrimEntries)
" text ".Split(new char[] {','}, StringSplitOptions.TrimEntries)

This next code should have the same result:
" text ".Split(new string[] {","}, StringSplitOptions.TrimEntries)
The result of this last call is " text ", not trimmed.

Configuration

Dotnet version 6.0.100
OS: MacOs BigSur 11.4
Architecture: x64

Regression?

Not verified in previous versions

[jplonghi]

https://dotnetfiddle.net/m3SYKq

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Issue Details

---

Description

Considering these next C# code snippets results is the trimmed string "text",
" text ".Split(',', StringSplitOptions.TrimEntries)
" text ".Split(",", StringSplitOptions.TrimEntries)
" text ".Split(new char[] {','}, StringSplitOptions.TrimEntries)

This next code should have the same result:
" text ".Split(new string[] {","}, StringSplitOptions.TrimEntries)
The result of this last call is " text ", not trimmed.

Configuration

Dotnet version 6.0.100
OS: MacOs BigSur 11.4
Architecture: x64

Regression?

Not verified in previous versions

Author:	ccamposh
Assignees:	-
Labels:	area-System.Runtime, untriaged
Milestone:	-