Error When Overriding Properties in Union Schema Using '@effect/schema/Schema'

import * as S from '@effect/schema/Schema'

export const CreateMissionInputSharedSchema = S.Struct({
  isPastEvent: S.NullOr(S.Boolean),
  endDate: S.NullOr(S.Date),
})

export const CreateRegisterMissionInputSchema = S.Struct({
  ...CreateMissionInputSharedSchema.fields,
  // Simpler example, but the actual schema is more complex
  otherFields: S.String,
})

export const CreateBridgeMissionInputSchema = S.Struct({
  ...CreateMissionInputSharedSchema.fields,
  // Simpler example, but the actual schema is more complex
  otherFields2: S.String,
})

// Simpler example, but the actual schema is more complex
export const CreateMissionInputSchema = S.Union(
  CreateRegisterMissionInputSchema,
  CreateBridgeMissionInputSchema,
)

const PastMissionOverrides = S.Struct({
  isPastEvent: S.Boolean.pipe(
    S.filter(isPastEvent =>
      isPastEvent || {
        path: ['isPastEvent'],
        message: 'isPastEvent must be true',
      }
    ),
  ),
  endDate: S.Date.pipe(S.filter(endDate =>
    endDate < new Date() || {
      path: ['endDate'],
      message: 'endDate must be a past date',
    }
  )),
})

export const CreatePastMissionInputSchema = S.extend(
  CreateMissionInputSchema,
  PastMissionOverrides,
)

import * as S from '@effect/schema/Schema'

export const CreateMissionInputSharedSchema = S.Struct({
  isPastEvent: S.NullOr(S.Boolean),
  endDate: S.NullOr(S.Date),
})

export const CreateRegisterMissionInputSchema = S.Struct({
  ...CreateMissionInputSharedSchema.fields,
  // Simpler example, but the actual schema is more complex
  otherFields: S.String,
})

export const CreateBridgeMissionInputSchema = S.Struct({
  ...CreateMissionInputSharedSchema.fields,
  // Simpler example, but the actual schema is more complex
  otherFields2: S.String,
})

// Simpler example, but the actual schema is more complex
export const CreateMissionInputSchema = S.Union(
  CreateRegisterMissionInputSchema,
  CreateBridgeMissionInputSchema,
)

const PastMissionOverrides = S.Struct({
  isPastEvent: S.Boolean.pipe(
    S.filter(isPastEvent =>
      isPastEvent || {
        path: ['isPastEvent'],
        message: 'isPastEvent must be true',
      }
    ),
  ),
  endDate: S.Date.pipe(S.filter(endDate =>
    endDate < new Date() || {
      path: ['endDate'],
      message: 'endDate must be a past date',
    }
  )),
})

export const CreatePastMissionInputSchema = S.extend(
  CreateMissionInputSchema,
  PastMissionOverrides,
)

Error: Unsupported schema or overlapping types
at path: ["isPastEvent"]
details: cannot extend null with boolean

Error: Unsupported schema or overlapping types
at path: ["isPastEvent"]
details: cannot extend null with boolean