Lots of unicode options for 'space' which can be found here: https://www.compart.com/en/unicode/search?q=space#characters
Below is a test with different unicode options and how the spaces display on the iphone.
<string>1 2 3 4 5 6 7 8</string>
The space between 6 & 7 is a Punctuation Space that looks better than 2007.  
samwise11
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Same problem here. Started with Big Sur. Crash after crash all day. MacBook Pro (16-inch, 2019)
panic(cpu 2 caller 0xffffff8007c9f6b6): [kext.kalloc.2048]: element modified after free (off:1672, val:0xffffffff00000000, sz:2048, ptr:0xffffff9366c03000, prot:zero)
1672: 0xffffffff00000000
Backtrace (CPU 2), Frame : Return Address
0xffffffb0baf631f0 : 0xffffff800748e02d
0xffffffb0baf63240 : 0xffffff80075d48e3
0xffffffb0baf63280 : 0xffffff80075c4eda
0xffffffb0baf632d0 : 0xffffff8007432a2f
0xffffffb0baf632f0 : 0xffffff800748d84d
0xffffffb0baf63410 : 0xffffff800748db43
0xffffffb0baf63480 : 0xffffff8007c9d68a
0xffffffb0baf634f0 : 0xffffff8007c9f6b6
0xffffffb0baf63970 : 0xffffff80074ec816
0xffffffb0baf639e0 : 0xffffff800749d60c
0xffffffb0baf63a30 : 0xffffff8007baf582
0xffffffb0baf63a50 : 0xffffff80086ebcd5
0xffffffb0baf63a70 : 0xffffff80086ebb70
0xffffffb0baf63b30 : 0xffffff80086724c2
0xffffffb0baf63bf0 : 0xffffff800872227d
0xffffffb0baf63de0 : 0xffffff8007bf54f5
0xffffffb0baf63e50 : 0xffffff8007bf53f6
0xffffffb0baf63e80 : 0xffffff80074d44b5
0xffffffb0baf63ef0 : 0xffffff80074d5424
0xffffffb0baf63fa0 : 0xffffff800743213e
Kernel Extensions in backtrace:
com.apple.driver.AppleBCMWLANCoreMac(1.0)[C29067F6-27FA-3A3A-8DA4-C7AEF8E6AF0C]@0xffffff8008635000-0xffffff80087ebfff
dependency: com.apple.driver.AppleMobileFileIntegrity(1.0.5)[9B4B41D7-B68F-33D5-80A4-2C4C4A649F6D]@0xffffff8008ab8000-0xffffff8008acdfff
dependency: com.apple.driver.IOImageLoader(1.0.0)[ACD7D7B1-169D-3541-8746-4856B308ACB2]@0xffffff8009c89000-0xffffff8009c99fff
dependency: com.apple.driver.corecapture(1.0.4)[4D0B62A8-C973-3B21-9252-4A5E7DF3B885]@0xffffff800a714000-0xffffff800a72afff
dependency: com.apple.driver.mDNSOffloadUserClient(1.0.1b8)[B5B3AA31-2371-332B-82C7-ED3711EABDEF]@0xffffff8009f59000-0xffffff8009f5dfff
dependency: com.apple.iokit.CoreAnalyticsFamily(1)[D5B09BBE-AC6C-341E-A9FE-B37DF7FDCE68]@0xffffff8008d65000-0xffffff8008d6bfff
dependency: com.apple.iokit.IO80211FamilyV2(1200.12.2b1)[A068D9D6-2542-3455-8143-F5BBD4334151]@0xffffff8009895000-0xffffff8009a18fff
dependency: com.apple.iokit.IONetworkingFamily(3.4)[EFF68ECC-483B-3BAC-82B9-09C8F0600009]@0xffffff8009cd2000-0xffffff8009ce8fff
dependency: com.apple.iokit.IOSerialFamily(11)[9787C647-19B8-36EB-BC27-2CD8D028FABF]@0xffffff800a01b000-0xffffff800a020fff
dependency: com.apple.iokit.IOSkywalkFamily(1)[8E95C676-D763-3923-BE43-E8BE08DD3C23]@0xffffff800a02a000-0xffffff800a04bfff
dependency: com.apple.iokit.IOTimeSyncFamily(980.4)[A5FA159E-C468-37EB-92A2-A4B6E527C671]@0xffffff800a1ac000-0xffffff800a1c7fff
dependency: com.apple.kec.corecrypto(11.1)[00A376AB-A0BD-3B83-A12D-A7039E31BD9B]@0xffffff800a736000-0xffffff800a7c7fff
Process name corresponding to current thread: kernel_task
Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev chunklist-security-epoch=0 -chunklist-no-rev2-dev
Mac OS version:
20E241
Kernel version:
Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64
Kernel UUID: 068F99A3-1DB3-31C0-87D5-09942F122BB6
KernelCache slide: 0x0000000007200000
KernelCache base: 0xffffff8007400000
Kernel slide: 0x0000000007210000
Kernel text base: 0xffffff8007410000
__HIB text base: 0xffffff8007300000
System model name: MacBookPro16,4 (Mac-A61BADE1FDAD7B05)
System shutdown begun: NO
Hibernation exit count: 0
System uptime in nanoseconds: 18554309350938
Last Sleep: absolute base_tsc base_nano
Uptime : 0x000010e003049a84
Sleep : 0x000001f9d400c38c 0x000004a59de19064 0x000000f61f051360
Wake : 0x000001fa043a6403 0x00000795e257f4dc 0x000001f9e4b7dd41
last started kext at 14610385052928: com.logitech.driver.LogiGamingMouseFilter 1 (addr 0xffffff7fa2628000, size 8192)
last stopped kext at 14680012327057: !UAudio 405.39 (addr 0xffffff7fa0712000, size 315392)