We're seeing the following error when trying to init the UP struct by calling UP() anywhere in a unit test. Is it Swift runtime related? The exception is: * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=10, ads=0x12a500a80) We see it on the following line: public var mS: MS = .none The struct can be created without any issues in a minimal sample test-case, but calling init always fails on Xcode 13.2.1 when testing in a full test suite that tests the offending .framework containing the creation of the struct. (note in case it matters: 1) the thread sanitizer is disabled to avoid another bug and 2) the scheme for the full app containing the .framework is used to run the unit tests, 3) variable names have been simplified) import Foundation public struct ADS: Codable {     public var a1: String?     public var a2: String?     public var c: String?     public var st: String?     public var cnt: String?     public var pC: String?     public var ph: String?     public var phExt: String?     public init(from decoder: Decoder) throws { // unneeded     }     public init(a1: String? = nil,                 a2: String? = nil,                 c: String? = nil,                 st: String? = nil,                 cnt: String? = nil,                 pC: String? = nil,                 ph: String? = nil,                 phExt _: String? = nil)     {         self.a1 = a1         self.a2 = a2         self.c = c         self.st = st         self.cnt = cnt         self.pC = pC         self.ph = ph     } } public struct PI: Codable {     public let id: String     public let cTD: CTD     public let nu: String     public let em: String     public let er: String } public struct CTD: Codable {     public let code: String     public let name: String } public struct LYY: Codable {     public let id: String?     public let tsSS: String     public let tsTC: String     public let tsWC: String     public let tsWG: String     public let tsSD: String     public let tsSDu: String     public let sdSDEd: String     public let sdSV: String     public let tsO: String     public let tsP: String     public let tsSH: String     var nu: String?     public let banner: String?     public let eL: Int?     public let let: String?     public let pi: String? } public enum MS: String, Codable {     case pe = "end"     case sb = "it"     case none } public struct UP: Decodable {     public var una: String?     public var lan: String?     public var dob: String?     public var fN: String?     public var lN: String?     public var eai: String?     public var gen: String?     public var bac: Double?     public var nP: String?     public var cuI: String?     public var mS: MS = .none // crashes here     public var acS: String?     public var eSc: Bool?     public var tBac: Double?     public var lyy: LYY?     public var hAds: ADS?     public var bAds: ADS?     public var pIs: [PI]?     public let lUd = Date()     public var cry: String?     public var lmP: Int?     public var lyyNu: String? {         get {             lyy?.nu         }         set {             lyy?.nu = newValue         }     }     public func getProfileDictionary() -> [String: Any]? {         return nil // unneeded     }     public var isUserLYY: Bool {        false // unneeded     }     public init() {     }     public init(from decoder: Decoder) throws { // unneeded     } } Stack Trace Xcode log output