Hello wateron,
Thanks for following up. After reviewing several articles that suggest Reset Network Settings, we're not able to locate the information you've provided. The following articles contain the information below and none of them mention Bluetooth settings being affected.
Return iPhone settings to their defaults
"Reset Network Settings: All network settings are removed. In addition, the device name assigned in > General > About is reset to “iPhone,” and manually trusted certificates (such as for websites) are changed to untrusted.
When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile or mobile device management (MDM) are removed. Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and Ask to Join Networks settings remain turned on.
To remove VPN settings installed by a configuration profile, go to Settings > General > Profiles & Device Management, select the configuration profile, then tap Remove Profile. This also removes other settings and accounts provided by the profile. See Install or remove configuration profiles on iPhone in this guide.
To remove network settings installed by MDM, go to Settings > General > Profiles & Device Management, select the management, then tap Remove Management. This also removes other settings and certificates provided by MDM. See “Mobile device management (MDM)” in the iOS Deployment Reference."
If you see No Service or Searching on your iPhone or iPad
"Reset your Network Settings.
Go to Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before."
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
"Still can’t connect?
Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before."
As previously mentioned, you do have the option of connecting with Apple Support for assistance at Get Support.
Hope this helps.