Laptop can't connect to 2.4GHz wifi access points if the SSID is marked as hidden

My Toshiba laptop has a WiFi card that can use both 2.4GHz and 5GHz frequencies. There are no problems connecting to an access point on a 5GHz channel if the SSID is hidden. However, if the access point is using a hidden SSID on the 2.4GHz frequencies, then I cannot connect. There is no issue if the SSID is not hidden.

I am running Ubuntu Desktop 20.04. When I was running 18.04 on this same machine, there was no issue whatsoever.

lsusb ####################
Bus 002 Device 003: ID 0480:0820 Toshiba America Inc Canvio Advance Disk
Bus 002 Device 002: ID 0424:5537 Microchip Technology, Inc. (formerly SMSC) USB5537B
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 010: ID 1c4f:0034 SiGma Micro 
Bus 001 Device 009: ID 0603:00f1 Novatek Microelectronics Corp. Keyboard (Labtec Ultra Flat Keyboard)
Bus 001 Device 007: ID 0d8c:0170 C-Media Electronics, Inc. 
Bus 001 Device 015: ID 12d1:107e Huawei Technologies Co., Ltd. 
Bus 001 Device 004: ID 0424:2137 Microchip Technology, Inc. (formerly SMSC) USB2137B
Bus 001 Device 011: ID 8087:0a2b Intel Corp. 
Bus 001 Device 003: ID 04f2:b5fe Chicony Electronics Co., Ltd TOSHIBA Web Camera - FHD
Bus 001 Device 008: ID 0b97:7772 O2 Micro, Inc. OZ776 CCID Smartcard Reader
Bus 001 Device 005: ID 0b97:7761 O2 Micro, Inc. Oz776 1.1 Hub
Bus 001 Device 017: ID 1004:633e LG Electronics, Inc. G2/G3 Android Phone [MTP/PTP/Download mode]
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   

lspci ####################
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #2 (rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #3 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev 21)
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
   

lshw -c network ##########
  *-network DESACTIVADO
       descripción: Interfaz inalámbrica
       producto: Wireless 8260
       fabricante: Intel Corporation
       id físico: 0
       información del bus: pci@0000:02:00.0
       nombre lógico: wlp2s0
       versión: 3a
       serie: 00:bb:60:b6:2b:3c
       anchura: 64 bits
       reloj: 33MHz
       capacidades: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuración: broadcast=yes driver=iwlwifi driverversion=5.11.0-44-generic firmware=36.77d01142.0 8000C-36.ucode latency=0 link=no multicast=yes wireless=IEEE 802.11
       recursos: irq:130 memoria:f1000000-f1001fff
  *-network
       descripción: Ethernet interface
       producto: Ethernet Connection I219-V
       fabricante: Intel Corporation
       id físico: 1f.6
       información del bus: pci@0000:00:1f.6
       nombre lógico: enp0s31f6
       versión: 21
       serie: ec:21:e5:0a:02:44
       tamaño: 1Gbit/s
       capacidad: 1Gbit/s
       anchura: 32 bits
       reloj: 33MHz
       capacidades: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuración: autonegotiation=on broadcast=yes driver=e1000e driverversion=5.11.0-44-generic duplex=full firmware=0.13-4 ip=192.168.250.190 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       recursos: irq:131 memoria:f1200000-f121ffff
  *-network DESACTIVADO
       descripción: Ethernet interface