Previous mods break the ModManager

[bttsmith]

I had issues upon installing the ModManager - it would not load at first but instead threw this error:

[Error : Unity Log] JsonSerializationException: Required property 'Summary' not found in JSON. Path '', line 10, position 1.
Stack trace:
ModManager.ModSystem.ModManifestFinder.LoadManifest (System.String manifestPath) (at :0)
ModManager.ModSystem.ModManifestFinder+d__2.MoveNext () (at :0)
System.Linq.Enumerable+SelectManySingleSelectorIterator`2[TSource,TResult].MoveNext () (at <5daa034a65ef4e92beb94b6ef26af36a>:0)
System.Linq.Enumerable.ToDictionary[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] keySelector, System.Collections.Generic.IEqualityComparer`1[T] comparer) (at <5daa034a65ef4e92beb94b6ef26af36a>:0)
System.Linq.Enumerable.ToDictionary[TSource,TKey] (System.Collections.Generic.IEnumerable`1[T] source, System.Func`2[T,TResult] keySelector) (at <5daa034a65ef4e92beb94b6ef26af36a>:0)
ModManager.AddonSystem.InstalledAddonRepository.Load (ModManager.StartupSystem.ModManagerStartupOptions startupOptions) (at :0)
ModManager.StartupSystem.ModManagerStartup.LoadClasses (ModManager.StartupSystem.ModManagerStartupOptions startupOptions) (at :0)
ModManager.StartupSystem.ModManagerStartup.Run (System.String apiKey, System.Action`1[T] options) (at :0)
ModManagerUI.ModManagerUIPlugin.Awake () (at :0)
UnityEngine.GameObject:AddComponent(Type)
BepInEx.Bootstrap.Chainloader:Start()
UnityEngine.InputSystem.InputSystem:.cctor()

After troubleshooting a bit, I found that mods installed from Thunderstore include a file called "manifest.json" rather than "mod.json" in their BedInEx folder. The ModManager does not take kindly to these manifest files. However, replacing the "manifest.json" file with a "mod.json" file allows the ModManager to load.