Removing The Nineteenth Byte Introduction
The Nineteenth Byte is CGCC's official chatroom (go check it out!). Its name is a play on the nineteenth hole, and it also refers to golf, which is appropriate for CGCC's chatroom's name. The name is also precisely \$19\$ bytes long, as its name states.
Challenge
Your task is to write a program that outputs Stack Exchange Chat - The Nineteenth Byte exactly. However, if the nineteenth byte and only the nineteenth byte of your source code is removed, it should output only Stack Exchange Chat. Because of this, the best score you can get will be \$19\$ bytes. For example, if your code is abcdefghijklmnopqrstuvwxyz, then abcdefghijklmnopqrstuvwxyz must output Stack Exchange Chat - The Nineteenth Byte and abcdefghijklmnopqrtuvwxyz must output Stack Exchange Chat.
Rules

Standard loopholes are forbidden.
Trailing whitespace is allowed.
If possible, please link to an online interpreter (e.g. TIO) to run your program on.
Please explain your answer. This is not necessary, but it makes it easier for others to understand.
Languages newer than the question are allowed. This means you could create your own language where it would be trivial to do this, but don't expect any upvotes.
You are scored by the length of the program that outputs Stack Exchange Chat - The Nineteenth Byte.
This is code-golf, so shortest code in bytes wins!
Jelly, 25 bytes
“¡TƑ9ı2ṆR“¡⁸¢6ṅȯ*ỵ#K»iƇ”h

Try it online! or Try it without #
Jelly, 25 bytes
“¡TƑ9ı2ṆR“¡TḟKY=ɱø~»tƑƇ⁶K

Try it online! or Try it without ~
How they work
“¡TƑ9ı2ṆR“¡⁸¢6ṅȯ*ỵ#K»iƇ”h - Main link. No arguments
“¡TƑ9ı2ṆR“¡⁸¢6ṅȯ*ỵ#K»     - Pair of compressed strings [&quot;Stack Exchange Chat&quot;, &quot; - The Nineteenth Byte&quot;]
                      Ƈ   - Keep those for which the following is True:
                     i ”h - They contain &quot;h&quot;; [&quot;Stack Exchange Chat&quot;, &quot; - The Nineteenth Byte&quot;]
                            Smash together and output

“¡TƑ9ı2ṆR“¡⁸¢6ṅȯ*ỵK»iƇ”h  - Main link. No arguments
“¡TƑ9ı2ṆR“¡⁸¢6ṅȯ*ỵK»      - Pair of compressed strings [&quot;Stack Exchange Chat&quot;, &quot;^Backets reamyappenzell&quot;]
                     Ƈ    - Keep those for which the following is True:
                    i ”h  - They contain &quot;h&quot;; [&quot;Stack Exchange Chat&quot;]
                            Smash together and output

And the second one:
“¡TƑ9ı2ṆR“¡TḟKY=ɱø~»tƑƇ⁶K - Main link. No arguments
“¡TƑ9ı2ṆR“¡TḟKY=ɱø~»      - Pair of compressed strings [&quot;Stack Exchange Chat&quot;, &quot;- The Nineteenth Byte&quot;]
                     ƑƇ   - Keep those where the following has no effect:
                    t  ⁶  -   Removing spaces from the front and end; [&quot;Stack Exchange Chat&quot;, &quot;- The Nineteenth Byte&quot;]
                        K - Join with spaces; &quot;Stack Exchange Chat - The Nineteenth Byte&quot;

“¡TƑ9ı2ṆR“¡TḟKY=ɱø»tƑƇ⁶K  - Main link. No arguments
“¡TƑ9ı2ṆR“¡TḟKY=ɱø»       - Pair of compressed strings [&quot;Stack Exchange Chat&quot;, &quot; Backets reamyappenzell&quot;]
                    ƑƇ    - Keep those where the following has no effect:
                   t  ⁶   -   Removing spaces from the front and end; [&quot;Stack Exchange Chat&quot;]
                       K  - Join with spaces; &quot;Stack Exchange Chat&quot;