ScreenBlanker module calls OS_Word without X bit on ticker

Hiya,

Simple one; on the ScreenBlanker Ticker handler, it calls OS_Word without the X bit set. For RISC OS 5.27, the trace looks like this:

Interrupt triggered (preceding instruction not executed)
Entering: Ticker event &fc284db8/&07007c70 {DA 'Extension ROM', module 'ScreenBlanker'}
fc284db8: {DA 'Extension ROM', module 'ScreenBlanker'}
==== Begin SWI misuse ====
SWI called without X-bit from non-USR mode: &7 (OS_Word)
Registers:
  r0  = &00000015, r1  = &07007cb3, r2  = &0700df7c, r3  = &000008b4
  r4  = &20000093, r5  = &00000000, r6  = &00000000, r7  = &00000000
  r8  = &00000000, r9  = &00000000, r10 = &0700df6c, r11 = &04107f2c
  r12 = &07007c70, sp  = &04107ed4, lr  = &00000000, pc  = &fc284de8
  CPSR= &20000013 : SVC-32 ARM fi ae qvCzn
  SPSR= &60000092 : IRQ-32 ARM fI ae qvCZn
Locations:
  r2  -> [&00000000, &00000000, &00000000, &00000000]
  r10 -> [&00000000, &00000000, &00000000, &000008b8]
  r11 -> [&04107f50, &07007ddc, &00000000, &0700d6c8]
  pc is DA 'Extension ROM', module 'ScreenBlanker'
  lr is DA 'Zero Page'
Recently executed code:
  ---- Block &fc284db8, 4 instructions ----
  fc284db8: {DA 'Extension ROM', module 'ScreenBlanker'}
  fc284db8: PUSH    {r0, r1, r2, r3, r4, r5, lr}
  fc284dbc: LDR     lr, [r12, #&14]
  fc284dc0: TEQ     lr, #2
  fc284dc4: POPEQ   {r0, r1, r2, r3, r4, r5, pc}
  ---- Block &fc284dc8, 2 instructions ----
  fc284dc8: MRS     r4, apsr
  fc284dcc: MSR     cpsr_c, #&13              ; #SVC-32 ARM fi ae qvczn
  ---- Block &fc284dd0, 6 instructions ----
  fc284dd0: STR     lr, [sp, #-4]!
  fc284dd4: MOV     r0, #4
  fc284dd8: ADD     r1, r12, #&43
  fc284ddc: STRB    r0, [r1]
  fc284de0: MOV     r0, #&15                  ; #21
  fc284de4: SWI     OS_Word
==== End SWI misuse ====

*ROMModules line:

Extension ROM 1 :     57 : fc2846bc : Active   : 2.34     : ScreenBlanker

Testing with RISC OS 5.31 RC3 this bug still remains:

==== Begin SWI misuse ====
SWI called without X-bit from non-USR mode: &7 (OS_Word)
Registers:
  r0  = &00000015, r1  = &0700b167, r2  = &07012a44, r3  = &00000240
  r4  = &20000093, r5  = &fc13b308, r6  = &0701302c, r7  = &fc13b308
  r8  = &0aea6e60, r9  = &0700b2cc, r10 = &04100230, r11 = &04107ed8
  r12 = &0700b124, sp  = &04107e6c, lr  = &00000000, pc  = &fc286b08
  CPSR= &20000013 : SVC-32 ARM fi ae qvCzn
  SPSR= &20000092 : IRQ-32 ARM fI ae qvCzn
Locations:
  r2  -> [&000002b0, &0000008e, &fc0ec4b4, &0000008f] in DA 'Module area'
  r5  -> [&0074743a, &e1a0c00d, &e92ddbf3, &e24cb004] in DA 'Extension ROM', module 'SharedCLibrary'
  r6  -> [&00000000, &00000000, &00000000, &00000000] in DA 'Module area', module 'ShellCLI%Base' workspace
  r7  -> [&0074743a, &e1a0c00d, &e92ddbf3, &e24cb004] in DA 'Extension ROM', module 'SharedCLibrary'
  r9  -> [&07012cf4, &00000000, &00000000, &00000010] in DA 'Module area', module 'ShellCLI%Base' private word pointer
  r10 -> [&00000000, &00000000, &00000000, &00000000] in DA 'SVC Stack'
  r11 -> [&fc139ad4, &07003978, &07003978, &fc08452e] in DA 'SVC Stack'
  r12 -> [&00000000, &00000000, &00000000, &00000000] in DA 'Module area', module 'ScreenBlanker%Base' workspace
  pc is DA 'Extension ROM', module 'ScreenBlanker'
  lr is DA 'Zero Page'
Recently executed code:
  ---- Block &fc286ad8, 4 instructions ----
  fc286ad8: {DA 'Extension ROM', module 'ScreenBlanker'}
  fc286ad8: PUSH    {r0, r1, r2, r3, r4, r5, lr}
  fc286adc: LDR     lr, [r12, #&14]
  fc286ae0: TEQ     lr, #2
  fc286ae4: POPEQ   {r0, r1, r2, r3, r4, r5, pc}
  ---- Block &fc286ae8, 2 instructions ----
  fc286ae8: MRS     r4, apsr
  fc286aec: MSR     cpsr_c, #&13              ; #SVC-32 ARM fi -- -----
  ---- Block &fc286af0, 6 instructions ----
  fc286af0: STR     lr, [sp, #-4]!
  fc286af4: MOV     r0, #4
  fc286af8: ADD     r1, r12, #&43
  fc286afc: STRB    r0, [r1]
  fc286b00: MOV     r0, #&15                  ; #21
  fc286b04: SWI     OS_Word
==== End SWI misuse ====